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A grating has 810 lines per centimetre, and a flat screen is perpendicular to the ray...

A grating has 810 lines per centimetre, and a flat screen is perpendicular to the ray that makes the central peak of the diffraction pattern. The screen is 2.20 m from the grating. If light of two wavelengths, 630 nm and 670 nm, passes through the grating, what is the separation on the screen between the fourth-order maxima for the two wavelengths?

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